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  <title>Document</title>
  <script src="./bind.js"></script>
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  <script>
    function add(a, b) {
      return a + b + this.c
    }
    let obj = {
      c:520
    }
    var c = 1000;
   
    let nf = bind(add,obj,1,5);
    console.log(nf(10,999));
  </script>
</body>
</html>